Specimen Number28-6-039Alternate NumberJR-97-89Commentsfrom Crowe research collection; J. Rosdeutscher MS materialsIn Teaching CollectionNoMineral(s)feldsparpyritequartzField Noteshydrothermal breccia, py matrixRock Namehydrothermal brecciaDistrictCripple CreekMineGrassy ValleyGeo-LocationDDHGVC-4 105ft.Deposit TypeDiatremeGeo-Coords[1] Reference MaterialRosdeutscher, J.A., 1999, Geology and Stable Isotope Geochemistry of the Grassy Valley Au Deposit, Cripple Creek District, Colorado: Evidence for Magmatic Fluids; University of Georgia MS thesis, 76 p.
28-6-039: hydrothermal breccia - Cripple Creek District - Grassy Valley Mine. Franklin College Collections, accessed 08/06/2026, https://digitalcollections.franklin.uga.edu/nodes/view/35931